c#的委托实例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Add(int num1, int num2)
   {
       Console.Write(num1 + num2); Console.Write('\n');
   }
        static void Subs(int i, int j)
        { Console.Write(i - j); Console.Write('\n'); }
       delegate void  Calc(int i,int j);//定义一个代理类型Calc，它可以用于定义各种参数为两个整数的任意方法；故
        static void Main(string[] args)
        {
            //Calc c1=new Calc(Add);
            //Calc c2=new Calc(Subs);
            //c1(3, 4);
            //c2(3, 4);
            Calc c = Add;
            c += Subs;
            c(8888, 7);
            Console.ReadKey();

        }
    }
}
     

the second example:

using System;
using System.Collections.Generic;
using System.Text;

namespace Delegate
{
    //定义委托，它定义了可以代表的方法的类型
    public delegate void GreetingDelegate(string name);
    class Program
    {
        public class GreetingManager
        {
            //在GreetingManager类的内部声明delegate1变量
            public GreetingDelegate delegate1;

            public void GreetPeople(string name)
            {
                if(delegate1!=null)
                    this.delegate1(name);
            }
        }
        private static void EnglishGreeting(string name)
        {
            Console.WriteLine("Morning, " + name);
        }

        private static void ChineseGreeting(string name)
        {
            Console.WriteLine("早上好, " + name);
        }
        private static void JapaneseGreeting(string name)
        {
            Console.WriteLine("おはよう, " + name);
        }

        //注意此方法，它接受一个GreetingDelegate类型的方法作为参数

        static void Main(string[] args)
        {
            GreetingManager gm = new GreetingManager();
            gm.delegate1 = EnglishGreeting;
            gm.delegate1 += ChineseGreeting;
            gm.delegate1 += JapaneseGreeting;

            gm.GreetPeople("Jimmy Zhang");
            Console.ReadKey();
        }
    }
}